Fair Value Of Financial Instruments (Schedule Of Assets And Liabilities, Measured At Fair Value) (Details) - USD ($) $ in Millions		Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	$ 16.0	$ 187.4
Restricted cash and cash equivalents	[1]	380.2	330.3
Restricted securities available for sale	[2]	66.1	59.3
Net investment in Loans receivable	[1]	7,216.4	6,777.2
Revolving secured line of credit	[1]	95.9	0.0
Secured financing	[1]	3,793.9	3,397.5
Senior notes	[1]	842.0	1,257.6
Other Borrowings	[1]	10.5	11.3
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	16.0	187.4
Restricted cash and cash equivalents	[1]	380.2	330.3
Restricted securities available for sale	[2]	52.8	47.5
Net investment in Loans receivable	[1]	0.0	0.0
Revolving secured line of credit	[1]	0.0	0.0
Secured financing	[1]	0.0	0.0
Senior notes	[1]	842.0	1,257.6
Other Borrowings	[1]	0.0	0.0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0	0.0
Restricted cash and cash equivalents	[1]	0.0	0.0
Restricted securities available for sale	[2]	13.3	11.8
Net investment in Loans receivable	[1]	0.0	0.0
Revolving secured line of credit	[1]	95.9	0.0
Secured financing	[1]	3,793.9	3,397.5
Senior notes	[1]	0.0	0.0
Other Borrowings	[1]	10.5	11.3
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	[1]	0.0	0.0
Restricted cash and cash equivalents	[1]	0.0	0.0
Restricted securities available for sale	[2]	0.0	0.0
Net investment in Loans receivable	[1]	7,216.4	6,777.2
Revolving secured line of credit	[1]	0.0	0.0
Secured financing	[1]	0.0	0.0
Senior notes	[1]	0.0	0.0
Other Borrowings	[1]	$ 0.0	$ 0.0

[1] Measured at amortized cost with fair value disclosed.

[2] Measured at fair value on a recurring basis.